YouTube API Playground: Error 403 - Quota Exceeded Despite Low Usage

I'm encountering an issue while using the YouTube API Playground. After successfully executing three requests, I started receiving the following error:

{"error": {"code": 403,"message": "The request cannot be completed because you have exceeded your quota.","errors": [      {"message": "The request cannot be completed because you have exceeded your quota.","domain": "youtube.quota","reason": "quotaExceeded"      }    ]  }}

quotastraffic

I've checked my quota settings, and it's set to 10,000 units. However, the usage from the console indicates 0%. I'm puzzled as to why I'm encountering this error when my usage is well below the quota limit.

I just tried to get my playlists. Nothing more.

Any insights or suggestions on how to troubleshoot and resolve this issue would be greatly appreciated. Thank you!